<@rafaelluik> I set my virtual memory size to "Defined by System" which is actually "System Managed Size"
( I thought it looked wrong so I checked..) and still the out of memory error happens. Still no answer I know of yet and it's May 2017.
Anyone solve why this happens?

Lack of (Pagefile) RAM Gives Out Of Memory Error:SOLVED JAN 15th 2017
Chances are your setting for pagefile size has never been changed. Well, it's time! Windows has been asleep at the wheel again and failed to notice that webpages are much more RAM intensive these days, and the default pagefile comes up a bit short when browsing. I can help some of you with the only thing that has worked for me since this Out Of "Memory" error started a few months back..
Try this:
Windows Control Panel > "System" > "Advanced System Properties" > then go to "Performance" section up top of the window, click "Settings".
Now you will see "Performance Options". Go to "Advanced" > Click "Change"and increase your pagefile size. (1.5X Actual)
It has worked for me and is still not giving me the "Out Of Memory" error since I did this!
I shouldn't so won't give advice for how to, or how big your pagefile should be, that's for you to enjoy.
Why is this anyways?? The reason is webpages are becoming much more RAM intensive and found that Windows (wake UP!) just hasn't adjusted default settings for this phenomenon. It may also be from the way Opera handles its paging operations while browsing. We already know Opera uses more RAM and has more instances when running (Task Manager) than IE or FireFox. Give this a try, it can't hurt your PC.
Just make your max pagefile 1.5 times actual physical RAM and it should work well! (If you already have lots of RAM this won't help!).
I've not had the error since I bumped up my pagefile size so it should work for you too.
Cheers.